Brake



1,646,035 Oct. 189 W. MCCONKEY BRAKE Filed Dec, 3l. 1925 2 Sheets-Sheet 2 INVENTOR Patented Oct. 18, 1927.

UNITED STATES .KONTGOHEBY W. MocoNmY, oF cercado, ILLINOIS,

PATENT OFFICE.'

ASSIGNOR '10 BENDIX BRAKE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION F ILLINOIS.

BRAKE. K

Application led December 3l; 19,25. Serial No. 78,553.

erably being operated by, means engaging it' between its ends, the connection with such means thus being displaced inwardly from the Wheel far enough to give ample clear ance for the wheel inV swivelling. In one desirable arrangement, Where the lever is jointed 'or otherwise arranged to act directly on the friction member of the brake, the inner end of the lever is fulcrumed on the axle. In an arrangementpreferred for double-acting brakes, having brake-applying means above the axle, the lever is' fulcrumed at its inner end on the chassis frame, preferably by a connectionincludmg a fabric or other flexible support which compensates for movement of the lever and for movement of the vehicle springs.

ln 'both arrangements, I prefer that the joint or equivalent at the outer end of the lever` should move in applying the brake perpendicularto the swivelling axis of the Wheel from an idle position spaced rpaterially from the axis to an activey position in or immediately adjacent the axis.

n important minorl feature of the v1nvention relates to arranging a brake control of this type sov that the pressure on the brake is varied in rounding a corner, to guard against skidding, preferably by relieving the pressure on the brake when the wheel is on the outside of the turn.

The above and other objects and features of the invention, including various novel combinations of parts and desirable particular constructions, will be apparent fr'fom'the following description of two illustratlve embodiments shown in the laccompanyingdrawings, in which:

Fig. 1 is a vertical section transversely through one froiit brake and associated parts, showing the lever in r'ear elevation;

Fig. 2 is a vertical section on the line 2-2 of Fig. 1, showing in side elevation the flexible supporton the chassis frame for the end of the lever;

F ig. 3 is a vertical Section through the brake only, on the line 3-3 of Fig. 1, show`- ing the shoes in side elevation;

Fig. 4 is a vertical section corresponding to Fig. 1, but showing a different brake and control;

Fig. 5 is a vertical section on the line5---5y through the brake of shoes in side elevation F ig. 3; and y Fig. 6 isa diagram, corresponding to a top plan view, illustrating the relief in pressure on the outer brake on a turn.

Each of thebrakes includes a drum 10 Fig. 4, showing the and corresponding to rotating with a wheeL-'the hub of which is shown at 12. The wheel is rotatably mounted on the spindle of a knuckle 14, swivelled at the end of a front axle 16. Axle 16, with a rear axle (not shown) supports through springs 18 a chassis frame 20. Drum 10 is closed at its open sidel by any suitable backing plateV 22.

The brake of Figs. 1, 2, and 3 includes a vreverse shoe 24 anchored at 26 on the'backmg plate 22, a central shoe 28 anchored at 30, and a servo shoe 32 pivotally connected at 34 to shoe 28. Shoes 24 and 32 are forked or otherwise formed at their ends to straddle or overlap the opposite ends of shoe 28. Anchor 26l passes through a relatively large opening in the web of shoe 28, and anchor 30 passes through relatively large openings in the arms forming the forked end of shoe 24. The brake is applied by a double ,cam 36 on a shaft 38. against the resistance of a return spring 38. An auxiliaryY spring 40 insures that shoe 32 will engage the drum first, then turning with the shoe 28, thus giving a smooth. and gradual application of the brake.

drum to apply v The brake of Figs. 4 and 5 includema first shoe 42 anchored at 44 on a bracket 46 riveted to the backing .plate 22,`and a servo shoe 48 pivotally connected to shoe 42 at 50. A return springA 52 holds the shoes laway from the drum, andan auxiliary spring 54 insures that shoe. 48 will engage the drum frst,.turning with the drum toapply shoe 42.

Except as further describedbelow, the above-identified parts or their erpiivalents ios u i side of the turn) may be of any desired construction. According to the present invention, the brakes, whether or not constructed as described above, are applied by novel mechanism shown mostly in Figs. l and 4.

In the arrangement of Fig. l, an arm 6G adjustably mounted on the end Vof the camshaft 38, terminates in a ball received in a socket formed in the outer end or" a horizontal lever 62 supported and fulcrmned on the chassis frame at its inner' end by means illustrated as a heavy fabric 64 of the type used for spring shackle substitutes,l etc.

Fabric 64 is shown'secured to trame 2() by a fastening 6G above the lever. to take the Weight, and by a fastening 68 ahead of the lever, which takes the pull on the fulcrum. The fabric is shown triangular in shape, with shaft 62 secured by nuts 70 at its free corner, so that the fabric may flex to compensate for movements of the lever and for movements due to springs 18. The lever 62 is operated by a brake rod or cable 72 or the like, connected between its ends.

In the arrangement o- Fig. Ll, the inner end of lever 74 is fulcrumed by any suitable joint 76 on the bottom of axle 16, While its outer end is turned vertically and Aprojected downwardly through a cylindrical connector 78. Connector 7 8 is held by arms forming the forked end of a thrust member 80 threaded into the split end of shoe 48 and clamped in adjusted position b a contracting and clamping screw 82. lever '74 is operated by a rod or cable 84 or the like, attached between its ends.

In the arrangement 'of Fig. l, arm 60 and lever 62 are connected by a. universal joint of the ball and socket type. In Fig, 4, connector 78, pivoted on the end of lever '7d and able to turn in the arms at the eiid of thrust member 80, also forms a universal joint. In" each case, the joint at the outer end of the lever moves in applying the brake perpendicular to the swivelling axis of the wheel from an idleposition spaced materially from that axis to an active position in or immediately adjacent that axis.

@When it is desired that the pressure on` the outer brake be relieved on a turn, the active position of the center of the joint is not exactly in the swivelling axis ot' the wheel, but is spaced a small fraction of an inch from that axis on the side opposite the wheel. This arrangement is illustrated on an exaggerated scale in the diagram of Fi 6.l Y

n Fig. 6, which corresponds to a top plan view, W is a line through the swivelling axis A parallel to the wheel when the vehicle ris moving straight ahead, and WR and WL areV respectively parallel to the wheel when swvelled to the right (on the outside of the turn) and to the left (in- The front of the car is toward the top, and the wheel is the left front wheel, in this diagram. The normal position of the center of the joint, with the brake applied and the wheel parallel to the line W, is at J parallel to VV'H the joint is swung to ".ll, in a direction relieving the teni-'ion on member 72 or Si, and therefore relieving the pressure on the brake. When the wheel is swirellerl parallel to WL, the joint is swung to JL, slightly increasing the pressure on the brake.

lVhile two illustrative embodiments have been described in detail, it is not my intention to limit the 'scope of the invention Ato those particular embodiments, or otherwise than by the terms of the appended claims.

Iclaim:

l. A sWivelled wheel having a brake and operatingA mechanism `lor the brake comprising. in combination, a lever ulcrumed at its inner end and having a brake-applying portion at its outer end movable from an idle position spaced materially from the swivelling axis of the wheel toward that axis, and ,brake-applying means engaging the lever between' its ends.

2. A swivellcd wheel having a brake and operating mechanism for the brake comprising, in combination, a lever fulcrumed at its inner end and having a brake-applying portion at its outer end movable substantially erpendicular to the swivelling axis of the wheel to its active position and `brakeap plying means engaging the lever between its ends.

3. A swivelled wheel having a brake and operating mechanism for the brake comprising, in combination, a lever tulcrumed at its inner end` a brake-applying joint at the outer end of the lever arranged adjacent the swivelling axis of the wheel at least when the brake is applied, and brake-applying means operatively engaging the lever between its ends.

4. A swivelled wheel having a brake, a chassis frame, and operating mechanism for the brake comprising, in combination, a lever flexibly supported and fulcrumed at its inner end'on the chassis frame, a brakeapplying portion at the outer end of the lever arranged adjacent the swivellmg axis oli the Wheel at least when the brake is applied, and brake-applying means operatively engaging the lever between its ends.

5. A vehicle having a chassis trame and a swivelled wheel with a brake, and comprising, in combinationtherewith, a brakeapplying device swivelling with the wheel, a lever jointed to said device at its outer end and movably supported and fulcrumed on the chassis frame at its inner end and restrained from rotation about its longitudinal axis, `and brake-applying means operatively engaging the lever between its ends.

When the wheel lll() 6. A vehicle having a chassis frame and a swivelled wheel w1th a brake, and comprising, in combination therewith, a ge'nerally vertical brake-applying arm swivelling with the wheel, a generally horizontal lever jointed to said device at its outer end and movably supported and -fulcrnrned on thc chassis frame at its inner end in a manner permitting it to move lengthwise,y and brakeapplying means operatively engaging the lever between its ends.

7. A vehicle having a chassis frame and ay swivelled wheel with a brake, and comprising, in combination therewith, a brakeapplying device swivelling with the wheel, a horizontal lever jointed to 'said device at its outer end, a flexible part secured to the chassis frame and supporting the inner end ot' the lever and serving as a fulcrum for the lever, and brake-applying means operatively engaging the lever etween its ends.

8. A vehicle having a chassis frame and a swivelled wheel with a brake, and comprising, in combination therewith. a brakeapplying device swivelling with the wheel, a lever jointed to said device at its outer end, and movable about its inner end in a generally horizontal plane, a piece of fabric secured to the chassis frame and supporting the inner end of the lever and serving as a fulcrum for the lever, and brake-applying means operatively engaging the lever hetween its ends.

9. .A vehicle having a swivelled Wheel with a brake, and comprising, in combina tion therewith, a brake-operating arm swivelling with the wheel and having its end movable from an idle position spaced from the swivelling axis of the wheel toward that axis, a lever fulcrnmed at its inner end and universally jointed at its outer end to said end of the hrakepperating arm, and lu'ake-applving means operatively engaging said lever hctween its ends.

l0. A vehicle having a swivelled wheel with a brake, and a chassis frame, and comprising. in combination therewith, a generally vertical brake-operating arm swivelling with the. wheeland having its end movable from an idle position spaced from the swivelling axis ot the' wheel toward that axis, a generally l'iorizontal lever fulcrurned at its inner end on the chassis frame and universally jointed at its outer end to said end of the brake-operating arm, and brake-ap tively engaging said part and"moving it in l.

applying the brake from a position spaced materially forward of the swivelling axis to an actie position immediately adjacent that axis such that swivelling the wheel to place it on the outer side of a turn tends to swing said part away from the leve'r to relieve the pressure on the brake.

12. A vehicle having a swivelled wheel with a hrake, and comprising, in combination therewith, a brake-applym part swivelling with the wheel, and a lever operatively engaging said part and moving it in applyin the brake from a position spaced materiay forward of the swivelling axis to an active position on the o posite side ot that axis from the wheel suc that swivelling the wheel to place it on the outer side of a turn tends to swing said part away .from the lever to relieve the pressure on the brake.

13. A. vehicle having a swivelled wheel with a brake and comprising, in combination therewit a brake-applyin part swivelling with the wheel, and a lever operatively engaging said art and moving it in applying t e rake om an idle sition spaced materially forward of the swlvelling axis of the wheel rearwardly to an active osition ad'acent'that axis such that swiveling the w eel varies the pressure on the brake.

14. A vehicle having a swivelled wheel with a brake and comprisin in comb? tion therewith, a brake-applying part s Lw elling' with the wheel, a lever fulctmhed at its inner end and operatively engaging said part at its outer end and moving it in applying the brake from an idle position spaced materially forward of the swivelling axis of the wheel rearwardly tcl'an active p0- sition adjacent that axis such that swivelling the wheel varies the pressure on the brake, and brake-applying means engaging said lever between its ends. n

In testimony whereof, I have hereunto signed my name.

MONTGOMERY W. MOCON KEY. 

